Roshan's parents gifted him magnets on his birthday. His parents told him that magnets could attract objects. He played with those magnets all day and experimented by attracting different materials onto it. He noticed that some materials got attracted to it while some didn't. After a few days, his magnets were not working well.

Now, answer the following questions.

(a) What materials do you think got attracted to the magnets?

(b) What materials do you think didn't get attracted to the magnets?

(c) Why do you think his magnets stopped working?

(d) What should Roshan do to fix his magnets?

(a) Materials made of magnetic substances such as iron, steel, are attracted to the magnets.

(b) Non-magnetic substances such as wood, plastic, are not attracted to the magnets.

(c) Magnets stopped working due to following possible reasons :

• The magnets might have been subjected to rough handling (like dropping or banging).
• They might have been heated accidentally.
• They might have been stored improperly (without magnetic keepers).

All these can lead to loss of magnetism (demagnetisation).

(d) He should try to magnetise them again by :

• Single touch or double touch method (stroking with another magnet).
• Magnetic induction.

Also, in future, he should store them properly with magnetic keepers to prevent demagnetisation.